Create user backup
From him will run scripts

CREATE USER 'backup'@'localhost' IDENTIFIED BY 'user_password';
GRANT SELECT, SHOW VIEW, RELOAD, REPLICATION CLIENT, EVENT, TRIGGER ON *.* TO 'backup'@'localhost';
GRANT LOCK TABLES ON *.* TO 'backup'@'localhost';

Create directory for backup
mkdir /backup/mysql/

Create bash script database.sh with content:
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#!/bin/bash

USER="backup"
PASS="user_password"

NOW="$(date +"%Y%m%d")"

/usr/bin/mysqldump -u $USER -p$PASS -A | /bin/gzip > /backup/mysql/all--$NOW.sql.gz
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Making a file executable
chmod +x database.sh

And run file database.sh